PORTLAND — Maine’s highest court is hearing arguments about Central Maine Power Co.’s  “smart meter” program today.

A group of ratepayers is challenging the program to replace 600,000 analog meters with digital devices.

They are appealing the the Maine Public Utilities Commissions’ dismissal of their complaint to the Maine Supreme Judicial Court. Among their arguments is that the PUC did not adequately address safety, privacy and security concerns over the meters.

CMP maintains that smart meters are safe, reduce energy use and allow utilities to better identify problems during power outages.

The PUC allows CMP customers to opt out of the program by paying $12 a month.